Deletes "post:<postId>:to" key when user deletes a post (no orphans).
Deletes "post:<postId>:to" key when user deletes a post (no orphans).

SiTLar/freefeed-server,FreeFeed/freefeed-server,golozubov/freefeed-server,SiTLar/freefeed-server,golozubov/freefeed-server,davidmz/pepyatka-server,FreeFeed/freefeed-server,pepyatka/pepyatka-server